Which of the following molecules has a nonzero dipole moment? A) CO₂ B) CBr₄ C) SiH₄ D) SO₃ E) PCl₃

Question

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PCl3 is a polar molecule because the electronegativity difference between chlorine and phosphorous atoms induces a dipole moment in the molecule. The geometry of the molecule, which is trigonal pyramidal, further enhances the polarity. In contrast, all other molecules in the options have symmetrical geometries or have polar bonds that cancel out their dipole moment, making them nonpolar.

Which of the Following Molecules Has a Nonzero Dipole Moment